What steel is Q345? Is the material ink cast steel?

Q345 is a kind of steel. It is a low alloy steel, which is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment and so on. "Q" indicates the yield strength, and Q345 indicates that the yield strength of the steel is 345MPa.

For the detection of Q345 steel, on the one hand, whether the element content of steel meets the national standard requirements, and on the other hand, whether the mechanical properties (yield strength and tensile test) of steel meet the standard is the most important.

Structural performance:

Q345 has good comprehensive mechanical properties, acceptable low temperature performance, good plasticity and weldability. It can be used as dynamic load-bearing structures, mechanical parts, building structures and general metal structures for medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, etc. Can be used for hot rolling or normalizing, and can be used for various structures in cold areas below -40℃.

Level classification:

Q345 can be divided into Q345A, Q345B, Q345C, Q345D and Q345E according to the grade. They represent the different temperatures of the impact.

Q345A level, is not to impact;

Q345B grade, impact at room temperature of 20 degrees;

Q345C, 0-degree impact;

Q345D level, that is, -20 degree impact;

Q345E, that is, -40 degree impact.

At different impact temperatures, the impact value is also different.

Chemical composition:

Q345A:C≤0.20，Mn ≤ 1.7，Si≤0.55，P≤0.045，S≤0.045，V 0.02 ~ 0. 15；

Q345B:C≤0.20，Mn ≤ 1.7，Si≤0.55，P≤0.040，S≤0.040，V 0.02 ~ 0. 15；

Q345C:C≤0.20，Mn ≤ 1.7，Si≤0.55，P≤0.035，S≤0.035，V 0.02~0. 15，Al≥0.0 15；

Q345D:C≤0.20，Mn ≤ 1.7，Si≤0.55，P≤0.030，S≤0.030，V 0.02~0. 15，Al≥0.0 15；

Q345E:C≤0.20，Mn ≤ 1.7，Si≤0.55，P≤0.025，S≤0.025，V 0.02~0. 15，Al≥0.0 15 .

The material is not ink cast steel, but low alloy steel.